31517005904 has 10 divisors (see below), whose sum is σ = 61064198970. Its totient is φ = 15758502944.

The previous prime is 31517005867. The next prime is 31517005913. The reversal of 31517005904 is 40950071513.

It can be written as a sum of positive squares in only one way, i.e., 30362365504 + 1154640400 = 174248^2 + 33980^2 .

It is a super-2 number, since 2×31517005904² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 984906419 + ... + 984906450.

It is an arithmetic number, because the mean of its divisors is an integer number (6106419897).

Almost surely, 2^31517005904 is an apocalyptic number.

It is an amenable number.

31517005904 is a deficient number, since it is larger than the sum of its proper divisors (29547193066).

31517005904 is a wasteful number, since it uses less digits than its factorization.

31517005904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1969812877 (or 1969812871 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 35.

The spelling of 31517005904 in words is "thirty-one billion, five hundred seventeen million, five thousand, nine hundred four".